Golf Club System with Golf Bag

ABSTRACT

A golf club system has at least one golf club shaft assembly and a plurality of detachable golf club head assemblies. The golf club shaft assembly includes a shaft segment, a grip, and a coupler. The golf club head assembly includes a golf club head, a head shaft segment, and a head coupler pin to reversibly mate the golf club head assembly to a golf club shaft assembly to make a golf club. Any one of the golf club head assemblies can be attached to the golf club shaft assembly using a coupler. A second coupler allows the at least one golf club shaft assembly to be split into an upper shaft segment and a lower shaft segment to reduce the size of the golf club system. The golf club system can include a golf bag to hold the at least one shaft and plurality of detachable golf club head assemblies.

This application claims the benefit of U.S. Provisional App. No. 61/747,180 filed Dec. 28, 2012 (pending) which is hereby incorporated by reference in its entirety.

BACKGROUND

1. Field of the Invention

Embodiments of the present invention relate generally to golf clubs and related equipment. More specifically, embodiments relate to a golf club system with golf clubs having interchangeable golf club heads that each can fit onto a single shared shaft, golf clubs that are easily transported, and golf bags for carrying components of such golf clubs.

2. Background of the Invention

Because of their weight and bulk, a full-sized set of golf clubs presents substantial transportation challenges for golfers. For example, it is often difficult or impossible to fit even one full-sized set of golf clubs in a car. This problem is compounded when air travel is involved where the already heavy and bulky full-sized set of golf clubs is made heavier and bulkier by flight cases or travel bags. For example, when a full-sized set of golf clubs is placed in a hard-shell flight case for air transportation, the resulting weight can be double that of the full-sized set of golf clubs without the flight case, not to mention the added bulk a hard-shell flight case adds. Soft-shell flight cases provide some solution to the weight and bulk of hard-shell flight cases. However, soft-shell flight can expose the golf clubs to the vagaries of baggage handlers.

Despite these problems, golfers struggle to travel with their golf clubs because of the high costs of renting club sets at remote destinations. This struggle often involves significant additional expense, such as that associated with over-sized or over-weight baggage. But, expense is not the only consideration. Generally, the quality of rental golf club sets available at the destination varies widely and is often inferior to the golfer's personal golf club set(s). Even where high quality rental golf club sets are available, many golfers eschew using them because many golfer have developed a personal feel for and comfort level with their own sets of golf clubs. For example, experienced golfers may prefer to give themselves at least a perceived advantage by using their own clubs. Thus, even the availability of high quality set(s) of rental or demo clubs may not meet a specific golfer's needs and/or desires.

Transporting full-sized sets of golf clubs poses other challenges. A golfer may face difficulty finding adequate trunk space in their car or storage space in their homes for full-sized golf club sets. For example, a number of common sports cars, such as the Chevrolet Corvette, have trunks that will not accommodate even one full-sized golf club set. As used herein, a full-sized golf club set refers to a set of golf clubs in which each club head in the golf club set is not detachable and is fixedly attached to its own shaft that is a handle or grip end of the golf club. Many smaller vehicle trunks also have trouble accommodating more than a single set of golf clubs. This problem of trunk space is made far worse when hard-shell flight cases noted above are involved.

Aside from trunk space issues, full-sized golf club sets are heavy. As a result, many young and more senior players have trouble lifting and/or carrying full-sized golf club sets.

Another issue with conventional golf clubs is that children learning the game of golf need clubs with different length shafts as they grow. Consequently, with conventional clubs a new golf club sets are required to accommodate the child's growth.

Finally, golf clubs are now sold with fitting as part of the sales process. All the various permutations and combinations of shaft length, stiffness, and grips for particular club heads are available to the customer during this fitting session. Building and maintaining a stock of clubs with all these permutations and combinations to be available for customer fittings becomes unwieldy if not impossible to maintain.

Thus, what is needed is a way to reduce the bulk and weight of a conventional golf club set while preserving the playing physics and other desirable characteristics of the golf clubs.

BRIEF SUMMARY OF THE INVENTION

Embodiments of the present invention reduce the bulk and weight of a conventional full-sized golf club set while preserving the playing physics and other desirable characteristics of golf clubs by introducing a compact and easy to use set of golf clubs. In an embodiment, the size and weight reduction is achieved by having only one or a few golf club shaft portions (or assemblies) of a golf club that include a grip, and a full set of club head portions (or assemblies) of a golf club that include the golf club head. Each golf club head portion can be coupled to any one of the golf club shaft portions using a coupler to form a golf club. The golf club head portions are easily detachable to allow changing of golf club heads with a particular golf club shaft portion. Because each portion of the golf club is shorter than a conventional golf club, and because only one or a few golf club shaft portions are required, the weight and bulk of conventional golf clubs sets is greatly reduced, which substantially improves portability of a golf club set according to embodiments.

Beyond the benefit of increased portability, it is also possible to choose among several shafts for any particular club head. This may expand the game of golf to include a new dimension of performance tuning because shafts vary considerably in stiffness or flex. Embodiments can allow all club heads to be matched to the best shaft for the playing situation at hand.

Embodiments can also include a golf bag designed to transport a golf club set according to embodiments of the present invention, and to facilitate play on a course. In an embodiment, the golf bag is an integral part of the overall system of golf club use, storage, and travel. Golf bags are described that allow the system to be small enough for standard airline luggage, or smaller still, as a carry-on bag.

In an embodiment, a second coupler is included to allow the golf club shaft portion to be further split into two segments to allow a further reduction in shaft segment length to allow a carry-on-sized bag version of the golf club. Such a golf club set will comply with the carry-on bag luggage maximum height limit of 22 inches. In use, this second coupler is assembled once at the beginning of a golfing session, whether that golf session is a fitting, a round, or other golfing session. As such, in an embodiment the second coupler may be threaded, which can be a more time consuming assembly.

In an embodiment, the golf bag functions as a “walking” or course bag that is slung over the shoulder with a strap, can be supported with extending legs when placed on the ground. In an embodiment, club heads can be selected and removed from or replaced in the bag with one hand operation. In an embodiment, clips work with the stitched pockets of the bag to hold club heads securely in position. In an embodiment, the clips are made of durable and flexible plastic. The bag according to an embodiment is inexpensive to manufacture owing to its “sewing ready” design. In another embodiment, the golf bag can be carried by a handle. Yet another embodiment allows the golf bag to be used as a “cart” bag that is attached to a support bar on the back of a golf cart.

In another embodiment, a golf bag is configured for travel or driving to practice at a driving range or other practice facility. A golf bag according to such embodiment is constructed to stand on legs and contains a pouch to hold a computing device such as a tablet computer for display of images, video, and audio. The display device can be used to provide instruction and/or support gamification. In an embodiment, the golf bag and components allow for placing and positioning a camera in the bag to record swing motion for storage and analysis.

Other embodiments include interworking golf club sets according to embodiments with swing motion sensing systems, GPS systems, golf club numbering and identification systems, web content display and applications, as well as gamification software strategies.

In an embodiment, coupling is achieved with a for mating a golf club shaft handle to a golf club head comprising a first pin adapted to fit into a handle end of a golf club shaft, a second pin adapted to fit into a club head end of a golf club shaft, and a coupling sleeve fixedly attached to one of the first pin and the second pin, the coupling sleeve further being reversibly attachable to the other of the first pin and the second pin to allow for mating of the golf club shaft handle to the golf club head when the coupler is in use on a golf club.

Additional features and embodiments of the present invention will be evident in view of the following detailed description of the invention.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 illustrates a shaft with grip and head fitted with the coupler components ready to be connected.

FIG. 2 illustrates a pull-back sleeve according to an exemplary embodiment of the present invention in isolation.

FIG. 3 is a cross sectional view through line 3-3 of the coupler of FIG. 2.

FIG. 4 is a cross-sectional view of a coupler according to an exemplary embodiment of the present invention showing a locking mechanism to limit rotational motion of the club head with respect to the shaft when the head is assembled to the shaft.

FIGS. 5A, 5B, and 5C illustrate three views of the shaft coupler insert with pressed in spring pin retainer for the locking mechanism according to a preferred embodiment of the present invention.

FIG. 6 illustrates a spring for use inside the coupler.

FIG. 7 illustrates another exemplary embodiment of a coupler having a second set of ball bearing for locking tile couple and pin during operation.

FIG. 8 illustrates exemplary storage for a detachable golf club head in a golf bag according to an embodiment of the present invention.

FIG. 9 illustrates a golf bag with a duffle and a rigid frame structure for the golf bag according to an embodiment of the present invention.

FIG. 9A illustrates another rigid frame structure for use a golf bag according to an embodiment according to an embodiment of the present invention.

FIG. 10 illustrates a side perspective view of a golf bag according to an embodiment.

FIG. 11 illustrates a perspective view of the interior of the Duffle of FIG. 9.

FIG. 12 illustrates a rear perspective view of a golf bag with duffle according to an embodiment of the present invention.

FIGS. 13A, 13B, and 13C illustrate rear, front, and side views respectively of a course bag according to an embodiment of the present invention.

FIG. 14 illustrates the interior structure of course bag 1301 according to an embodiment of the present invention.

FIG. 15 illustrates additional detail of a loop sizing strap 1402 and a slash pocket inside a course bag 1301 according to an embodiment of the present invention.

FIG. 16 illustrates interior rigidity panels that can be used to add structure to a course bag according to an embodiment of the present invention.

FIG. 17 illustrates details of a clip assembly to anchor clip used to hold club shaft segments in place according to an embodiment of the present invention.

FIGS. 17A-17F illustrate a clip assembly according to an embodiment of the present invention.

FIGS. 19A and 19B illustrate detail of a threaded coupler used to reduce shaft length in unassembled form according to an embodiment of the present invention.

FIG. 20 illustrates a cross sectional view of the threaded coupler of FIGS. 19A-C in place in a shaft handle according to an embodiment of the present invention.

FIGS. 20A-20G illustrate a coupler according to an embodiment of the present invention.

FIGS. 20H1-20H9 illustrate a grip end fitting according to an embodiment of the present invention.

FIGS. 20I1-20I5 illustrate a coupler body according to an embodiment of the present invention.

FIGS. 20J1-20J3 illustrate an anti-rotation pin according to an embodiment of the present invention.

FIGS. 20K1-20K10 illustrate an anti-rotation pin according to an embodiment of the present invention.

FIGS. 20L1-20L5 illustrate an anti-rotation pin according to an embodiment of the present invention.

FIGS. 20M1-20M5 illustrate an anti-rotation pin according to an embodiment of the present invention.

FIGS. 20N1-20N5 illustrate an anti-rotation pin according to an embodiment of the present invention.

FIGS. 20O1-20O3 illustrate an anti-rotation pin according to an embodiment of the present invention.

FIG. 21 illustrates a complete club with both the threaded coupler of FIGS. 19A-C and 20, and the coupler of FIG. 2 according to an embodiment of the present invention.

FIG. 22 illustrates a perspective view of a carry-on bag according to an embodiment of the present invention.

FIG. 23 illustrates a perspective side view of a carry-on bag according to an embodiment of the present invention.

FIGS. 24A and 24B illustrate detail of the three fold panel insert according to an embodiment of the present invention.

FIGS. 25A and 25B illustrate the rear view and close up of the stiffener sleeve of the three fold panel according to an embodiment of the present invention.

FIG. 26 illustrates a three-fold panel insert folded and placed in a carry-on bag according to an embodiment of the present invention.

FIG. 27 illustrates a standard golf bag with a sleeve support for a putter shaft according to an embodiment of the present invention.

FIG. 28 illustrates a standard golf bag with a sleeve support for long-shafted putter shaft and head according to an embodiment of the present invention.

FIG. 29 illustrates a standard golf bag with side bag support for several heads.

FIG. 30 illustrates a side perspective view and a back perspective view of golf bag configured as a backpack according to an embodiment.

FIG. 31 is an interior view of a golf bag configured as a backpack according to an embodiment of the present invention.

FIG. 32 illustrates a system for collecting data related to using a golf club according to an embodiment of the present invention.

FIG. 33 is a schematic diagram of an exemplary system for collecting golf-related data for use in play, practice, and/or gamification according to an embodiment of the present invention.

FIGS. 34A-34J illustrate an embodiment of a golf bag for storing and transporting a golf club set according to another embodiment of the present invention.

FIGS. 35A-35C illustrate a telescoping leg option that provides a support stand for a golf bag according to an embodiment of the present invention.

FIG. 36 illustrates a removable computer tablet pouch panel according to an embodiment of the present invention.

FIG. 37 illustrates a removable computer tablet pouch panel according to another embodiment of the present invention.

FIG. 38A-38D illustrate expandable side panels according to an embodiment of the present invention.

FIG. 39 illustrates a handle 3902 that, in an embodiment, is sewn into a top portion of a golf bag according to an embodiment of the present invention.

FIG. 40 illustrates straps configured to store one or more golf tees according to an embodiment of the present invention.

DETAILED DESCRIPTION OF THE INVENTION

FIG. 1 illustrates components of a golf club 10 according to an embodiment that are mated together to form golf club 10. Golf club 10 comprises a golf club shaft portion 103 and a golf club head portion 501. Golf club shaft portion 103 is also referred to herein as a golf club shaft assembly or a shaft assembly. Golf club head portion 501 is also referred to herein as a golf club head assembly or a head assembly. As shown in FIG. 1, golf club shaft portion 103 and golf club head portion 501 are positioned for mating to one another. Golf club shaft portion 103 comprises a handle shaft segment 100, a grip 101, and a coupler having a coupler housing 200. In an embodiment, grip 101 is attached to handle shaft segment 100. Golf club head portion 501 comprises a golf club head 500, a golf club head insert sheath 504, a head shaft segment 102, a coupler hilt ring 114, and a head coupler pin 106. As illustrated in FIG. 1, golf club head portion 501 is detachable from golf club shaft portion 103. An exemplary coupler comprising a coupler housing, such as coupler housing 200, and a coupler header pin, such as coupler head pin 106, for use in embodiments is described in U.S. patent application Ser. No. 14/083,253, filed Nov. 18, 2013, U.S. Pat. No. 8,585,512, filed Dec. 23, 2011, U.S. Pat. No. 8,083,606, filed Nov. 16, 2009, and U.S. Pat. No. 7,618,329, filed Sep. 29, 2005, each of which is hereby incorporated by reference in its entirety.

In an embodiment, handle shaft segment 100 is cut from a standard full-sized shaft, and sized to accommodate the shortest club length in a conventional full-sized golf club set, which is generally the putter. Alternatively, handle shaft segment 100 is manufactured to be a desired length, rather than cut to size from a standard full-sized shaft. In an embodiment handle shaft segment 100 includes a grip (or handle) 101.

Golf club head portion 501 is designed to be mated golf club shaft portion 103 to form golf club 10. In an embodiment, golf club head portion 501 includes a head shaft segment 102 between a club shaft insert sheath 504 and head coupler pin 106. In an embodiment, head shaft segment 103 is shorter in length than golf club shaft portion 103. In use, golf club coupler pin 106 is inserted into shaft coupler portion 200 to form golf club 10. In an alternate embodiment, coupler portion 106 is fixedly attached to handle shaft segment 100, and the coupler housing 200 is fixedly attached to golf club head portion 501.

In a conventional golf club set, the length of handle shaft segment 100 can vary from club to club. As a result, in a conventional golf club set the length of handle shaft segment 100 can be set to optimize the length for each particular golf club in the golf club set. For example, longer golf clubs such as woods or long irons usually have longer overall shafts than short irons, wedges, and or putters (although some golfers prefer putters having long shaft length).

In a golf club set according to an embodiment of the present invention, the length of handle shaft segment 100 can be fixed, while the length of head shaft segment 102 is allowed to vary to optimize the length of a particular golf club depending upon which golf club head 500 is attached to head shaft segment 102. For example, if a golf club head 500 is a driver, head shaft segment 102 can be longer, whereas if golf club head 500 is an iron, head shaft segment 102 can be shorter. In each case, the total length of the golf club after mating will be the same as a corresponding golf club in a conventional full-sized golf club set. However, when uncoupled the two pieces, golf club shaft portion 103 and golf club head portion 501 each have lengths that are shorter than a conventional full-sized golf club.

In an embodiment, coupler housing 200 includes a set of ball bearings that are squeezed between tracks in a coupler body and tracks in a coupler pull-back sleeve. Released tension and lateral motion of the pull-back sleeve allows head coupler pin 106 to which a club head is attached to be inserted. Once inserted, release of tension on the pull-back sleeve brings force to bear on flat surfaces of the head coupler pin 106. This force pulls a conical surface on head coupler pin 106 into contact with a mated conical sheath surface in coupler housing 200. These two conical surfaces can be manufactured relatively easily and inexpensively and do not suffer from the many of the machining tolerance issues of a straight cylinder design.

In an embodiment, coupler 200 comprises an inner housing and a pull-back sleeve, whereby the pull-back sleeve is movable with respect to the inner housing to allow for movement of one or more first ball bearings within the coupler such that in a first pull-back sleeve position, the ball bearings allow insertion of an insertion pin during mating of the first and second shaft segments, and in a second pull-back sleeve position, the ball bearings hold the insertion pin axially in place to reversibly secure the first shaft segment to the second shaft segment.

FIG. 2 illustrates a pull-back sleeve according to an exemplary embodiment of the present invention in isolation. FIG. 3 is a cross sectional view through line 3-3 of the coupler of FIG. 2, which illustrates an exemplary mating of shaft coupler housing 200 with head coupler pin 106 according to an embodiment. As shown in FIG. 3, in an embodiment, handle shaft segment 100 is fitted to coupler housing 200 via an insert pin 108. In an embodiment, insert pin 108 is pressed and glued into the shaft. It would be apparent to those skilled in the art of other ways to affix coupler housing 200 to handle shaft segment 100.

Modern club shafts are often tapered such that their inner diameter varies-along the length of the shaft, getting smaller as distance from the handle increases. Although, club lengths can be tailor fit to a particular player's preferences, in general, club lengths for most players are typically based on arm length and height of the player, and generally vary less than six inches from golfer to golfer. Because the difference in diameter for a shaft over a six inch section typically is not significant, in an embodiment, the diameter of insert pin 108 is set to fit the smallest diameter of shaft 100. This corresponds, for example, to the longest club for the tallest player. In another embodiment, the diameter of insert pin 108 is selected optimally to fit the internal diameter of a golf club shaft having a shaft length used for the average person. In another embodiment, the diameter of insert pin 108 is custom fitted to a player's specifications.

In an embodiment, insert pin 108 includes a threaded end 108 a to accept a fixed coupler housing 200. This thread is preferably counterclockwise for right handed players and clockwise for left handed players. The desire for different threading direction based on handedness is due, in part, to the opposing torque/twists generated by left- and right-handed golfers about the shaft. That is, in use, this directional threading will tend to tighten the coupling of insert pin 108 with coupler housing 200 when a player strikes a golf ball. Coupler housing 200 has internal threads to appropriately match threaded end 108 a of pin 108. Coupler housing 200 may also be affixed to shaft 100 in other ways known in the art, for example, using epoxy.

As shown in FIG. 3, coupler housing 200 has several features. It has a conical portion 204 to mate with a matching conical surface 106 a of the head coupler pin 106 affixed to club head 500. In addition, in an embodiment, it has multiple ball bearing guide holes 206 to hold ball bearings 300 in place. FIG. 3 illustrates only one such guide hole 206 and ball bearing. However, other guide holes 206 and ball bearings 300 may be located about the perimeter. For example, in an embodiment, there are three equally spaced guide holes 206 located about a perimeter of coupler housing 202.

FIG. 4 is a cross-sectional view of a coupler according to an exemplary embodiment of the present invention showing a locking mechanism to limit rotational motion of the club head with respect to the shaft when the head is assembled to the shaft. As shown in FIGS. 2 and 4, in an embodiment, coupler housing 200 includes a notch 208, which provides a clocking fit to an alignment pin 120 attached to coupler pin 106. Alignment pin 120 and notch 208 assure the shaft handle always lines up the same way with any club head that is attached. Another pin 110 is press fit into the side of coupler housing 200 to provide clocking into the “L” shaped guide of a pull back sleeve 202.

In an embodiment, head coupler pin 106 is inserted and glued, or otherwise affixed, into the head shaft segment 102 as previously described. As described above, head shaft segment102 can vary in length significantly depending on the club head to which it is attached. Thus, due to the taper along the length of head shaft segment 102, the inside diameter of head shaft segment 102 can vary significantly from club head to club head. Unlike the case with handle shaft segments 100, this variation may be enough to require head coupler pins 106 of varying diameters. This may or may not be a need in other embodiments where, for example, a manufacturer may simply standardize an inner diameter of head shaft segment 102. The design described here relies on modification of readily available club components which have variations.

FIGS. 5A, 5B, and 5C illustrate three views of the shaft coupler insert with pressed in spring pin retainer 210 for the locking mechanism according to a preferred embodiment of the present invention. FIG. 6 illustrates a spring 400 for use inside coupler housing 200. In an embodiment, coupler housing 200 includes a press-fit pin 210 to hold a twist to a spring 400. As shown in FIGS. 5A, 5B, and 5C, pin 210 and hole 214 work together to hold spring 400 in a position of tension to provide a twisting force for the operation of the locking mechanism. Pin 210 wedges the base of the spring 400 and hole 214 receives a short vertical section 402 at the end of spring 400. Spring 400 is twisted to latch during assembly. The twist maintains coupler housing 200 in locked position at all times. In operation, pull back sleeve 202 must be twisted and pulled back by a golfer in order to pull out the head. When the coupler pin is extracted, a pin 110 slides into a retaining area 212 to hold it in place until another coupler pin 106 for another head is inserted. This simplifies the hand motions necessary to insert and extract a club while allowing an automatic locking of the coupler.

Head coupler pin 106 has a pressed in pin 120 for locking fit as previously described. Although other kinds of pins can be used, the use of a press fit pin here, and other places in the invention, is preferred as it reduces cost and complexity of manufacture.

In an embodiment, pull back sleeve 202 has a knurled surface 230, which facilitates gripping for hand operation. Although this is shown as a knurled surface, it may be of any surface texture, including being smooth, so long as the sleeve is movable by a user gripping coupler housing 200 by hand. In an embodiment, pull back sleeve 202 is pulled and rotated at various times during operation. Pull back sleeve 202 has several surfaces which help make the coupler hold without “play”. The conical, or rounded, surface of the end of coupler pin 106 is slowly sloping to allow easy insertion. This rounded end surface presses on ball bearing(s) 300 during insertion. Ball bearing(s) 300 alternately push on a surface 216 of pull back sleeve 202. The force of insertion is translated by the angles and rotation of the ball bearings into a motion of pull back sleeve 202 against spring 400.

During insertion, the operator pulls pull back sleeve 202 toward the shaft (handle end) using thumb and index finger. This positions the ball bearings 300 free from surface 216 so they can allow passage of the nose of head coupler pin 106. When the ball bearings 300 pass over the crest of the nose surface on head coupler pin 106, they “fall” into contact with a surface 118. When this occurs, pull back sleeve 202 can be released coming to rest close to the coupler pin hilt ring 114. In this position the clocking pin 120 is at rest in notch 208, and ball bearing(s) 300 is in contact with surfaces 116 and 216.

As pull back sleeve 202 moves in the direction away from club head 500, locking pin 110 becomes clear of notch 212. As this occurs, the twisting force of spring 400 causes sleeve 202 to rotate until pin 110 slides into channel 212 a. As pin 106 presses further into coupler housing 200, pull back sleeve 202 continues to move further away from club head 500. This can be seen as an increasing gap between sleeve 202 and a “hilt” region 114 of head coupler pin 106. When the ball bearing(s) 300 pass over the crest of surface 116 they “fall” into contact with surface 216. As this occurs, sleeve 202 changes direction and comes to rest close to the coupler pin hilt ring 114. In this position, locking pin 120 is at rest in the notch 208 and the ball bearing(s) 300 is in contact with surfaces 116 and 216.

The angle of surface 116 is steep enough to make a force large enough to enable the ball bearing(s) 300 to “climb” up and thus uncouple. Under static conditions, the force necessary to make this uncoupling occur are well beyond those found in golf club operation. The angle of surface 216 should not be so steep, however, that it cannot be uncoupled by hand when pull-back sleeve 202 is manipulated by the user. For example, in one embodiment, the angle of surface 216 is approximately 12 degrees.

To account for this possibility of vibration assisting the “climb,” which might cause unintentional separation, in an embodiment, the twist locking mechanism described above using pin 110 is employed. However, the locking mechanism is not necessary for the operation or manufacture of a golf club with interchangeable heads according to embodiments of the present invention.

Moreover, other locking mechanisms, for example, the use of a ball bearing for locking pin 110 can be used in embodiments of the present invention to assure adequate locking during operation. The mechanism described here is preferred to simplify the manual operation of the coupler.

FIG. 7 shows coupler 1200 with pin 1106 inserted and held in place by ball bearings 1300 and locked by bearings 1350 according to another embodiment. Bearings 1350 are held in coupler 1202 by holes 1226. There are three bearings 1350 oriented 120 degrees apart (similar bearings 1300). When these bearings are between surfaces 1140 of pin 1106 and surfaces 1240 of the pull back sleeve 1202, coupler 1200 will be locked and can only be released by manual operation. To visualize this, one can imagine ball bearings 1300 climbing surface 1206 and thus causing pull back sleeve 1202 to move towards the shaft 100 (not shown in FIG. 7). This would allow pin 1106 to begin to uncouple. Ball bearings 1350 will then wedge against surface 1142, which is perpendicular to this direction of motion. The combination of surfaces 1140, 1142, and 1240 form a sort of box, which is filled by ball bearing 1350, thus preventing uncoupling.

Manual uncoupling is possible because the operator moves the pull back sleeve 1202 against spring 1400, positioning surface 1250 at ball bearing 1350. In this position, the ball bearings 1350 can move out of the way of the coupling pin 1106 and extraction can occur. Insertion is done in an analogous, but reverse manner.

As can be seen, in an embodiment, the coupler has two points of contact and three near points of contact are designed into the coupler to give the pin a more solid fit. The areas of contact are the ball bearing race and the conic section. The areas of near contact are the end of the pin, the base of the pin and the anti-rotation pin and slot. Incorporating the three areas of near contact yield the features of tight perceptual fit and the ability to still remove and reinsert the pin to connector. These near fit areas are designed to be regions that are not held firm by spring tension. Fit in these areas, in an embodiment, contains an approximate 0.001″ gap. The gap may be greater depending on implementation. The combination of these areas and the fitting design described yield a low cost manufacturable product with acceptable perceptual feel.

A golf club system according to an embodiment of the present invention would not be suitable necessarily for use with conventional golf bags because conventional golf bags are designed to carry multiple golf clubs, each having its own shaft and non-detachable golf club head, that is, a full-sized set of golf clubs. Accordingly, a new bag design is desirable for carrying the various heads and shaft(s) that may be present in embodiments.

An exemplary golf bag comprises a cloth loop and elastic strap for holding the one or more shafts and a compartment having a plurality of fitted compartments for housing each of the plurality of club heads. Versions of the golf bag may vary depending on the physical space requirements and the performance required by the golfer. One embodiment of the golf bag may be the size of checked luggage. This embodiment favors the best performance since the shaft handle has only one coupler. This bag may be carried inside a duffle that protects it from baggage handling distress as well as supplying ample space for gear and clothing for short trips. Another embodiment of the bag may be the size of carry-on luggage. In an embodiment, this bag contains a folding panel that unfolds and attaches via straps to the support bar in the back of a golf cart.

The size and weight of golf bags according to embodiments are considerably less than standard golf bags. Moreover, embodiments of golf bags according to embodiments appeal to different users and function in different playing or practice environments.

While bag design may vary considerably, each of the golf bag embodiments share some common features. For example, the size of the golf bag is determined by the longest golf club shaft segment 103 in the golf club set. Moreover, each of the golf bag embodiments can store golf club heads in a similar manner.

FIG. 8 illustrates exemplary storage for a detachable golf club head 802 in a golf bag according to an embodiment. A strap pouch 806 is sewn into a lining of the golf bag to hold detachable golf club head 802 at sewing anchors 808. In an embodiment, the lining covers a rigid backing panel 1602 described below with respect to FIG. 16. To prevent movement of detachable golf club head 802, golf head shaft segment 102 is held in position by a clip 804. Clip 804 and strap pouch 740 work together to hold detachable golf club head 802 in place. Moreover, this configuration allows for single hand operation, that is removal and replacement of detachable golf club head 802 into its stored position.

Other materials may be used to store the clubs. Furthermore, other physical orientations can be selected to optimize space usage and/or ease of club access. For example, another orientation of clubs in the bag could leave the each detachable club head 802 in foam with the coupler pin 106 end exposed. Such an orientation would allow the user to press the coupler housing 200 onto the coupler pin 106 to perform the coupling while the head is held by the bag. Once coupled, the assembled club can then be extracted by the user.

Referring to FIGS. 9, 9A, and 10-12, in an embodiment the bag holding the clubs is paired with a duffle bag to form a golf bag 902. In an embodiment, golf bag 902 is made to meet the specifications of standard luggage. The duffle bag adds a protective layer over the golf bag 902. Golf bag 902 can also have wheels 904, a rigid frame 901, feet 906 and 908 for standing support and straps 910 for lifting and carrying. As shown in FIG. 9, rigid frame structure 901 has holes or slots 912 for wheels 904. FIG. 9A illustrates another embodiment of rigid frame structure 901 having cutouts for wheels 904. In an embodiment, rigid frame structure 901 is made of plastic, such as polyethylene. Rigid frame structure 901 may also be made using any other suitable materials, such as graphite, carbon fiber, titanium, steel, or aluminum.

FIG. 10 illustrates a side perspective view of golf bag 902 according to an embodiment. Referring to FIG. 10, golf bag 902 can include straps 1002 for dragging, such as in a rolling operation. Additional features of golf bag 902 outside the bag include one or more shoulder strap rings 1004, a water bottle pocket 1006, and a storage pocket 1008.

FIG. 11 illustrates a perspective view of the interior of the Duffle of FIG. 9. Referring to FIG. 11, inside of golf bag 902 also includes storage pockets 1102 and 1104, and elastic shoe holders 1108. These features are exemplary and serve to illustrate additional features of a golf bag embodiment. Other features can be included in golf bag 902 according to an embodiment.

FIG. 12 illustrates a rear perspective view of golf bag 902 according to an embodiment. As can be seen, in an embodiment, golf bag 902 includes wheels 904 and straps 910.

FIGS. 13A, 13B, and 13C illustrate rear, front, and side views respectively of a golf bag 1301 configured for use on a golf course according to an embodiment. Golf bag 1301 is sometimes referred to herein as course bag 1301. FIG. 13A is a rear view of course bag 1301. FIG. 13B is a front view of course bag 1301. FIG. 13C is a side view of course bag 1301. Course bag 1301 has a number of exemplary features that make it useful in the traditional golf environment on a golf course. For example, course bag 1301 includes an extending leg system 1302, which in an embodiment is operated by a foot 1304 in a well-known manner, a containment flap 1306 to protect extending leg system 1302, conical loops 1308 and 1310 that can serve as an umbrella holder, and straps 1312 and 1314 for cinching the bag bar on a golf cart. Other features of course bag 1301 include a handle 1315, a shoulder strap rings 1316, a shoulder strap 1318, a pocket 1320, a moisture protection covering 1322, and a zipper 1324.

FIG. 14 illustrates the interior structure of course bag 1301 according to an embodiment of the present invention. As shown in FIG. 14, course bag 1301 includes a number of exemplary features in an embodiment. A plurality of club head strap pouches 806 and clips 804 accommodate a plurality of club heads as described above with respect to FIG. 8 for a single club head. In an embodiment, course bag 1301 further includes a plurality of adjustable club head strap pouches such as head strap pouch 1402 and a ring 1404, an accessory pocket 1406, and a ball caddie pocket 1408. In an embodiment, ball caddie pocket 1408 holds a plurality of golf balls for single hand dispensing at a stiff cloth aperture 1410 at the bottom of ball caddie pocket 1408. A clear plastic cover 1412 allows the golfer to assess the number of remaining balls. A stiff cloth top aperture at the top of ball caddie pocket 1408 is used to input new balls into ball caddie pocket 1408. On accessory pocket 1406, clear pocket cover 1414 holds a score card. In addition, elastic strapping 1416 is stitched to hold pens or pencils. Course bag 1301 can also includes a pocket 1422. In an embodiment, pocket 1422 is a slash pocket. Elastic strapping 1418 and cloth 1420 hold one or two golf club shaft portions, such as golf club shaft portion 103. These golf club shaft portions would have different lengths. Additional golf club shaft portions can be stored in golf bag 1301 if desired.

Because the length of golf club shaft portion 101 sets the minimum height of golf bag 1301, the height of the golf bag 1301 can be less than a conventional golf bag. For example, in a conventional golf bag the longest club (the driver, or one wood, for instance) sets the overall height of the bag, or approximately 50 inches. In an embodiment of the invention, on the other hand, the height of golf bag 1301 can be 36 inches, almost a full 14 inches less than the height of a conventional golf bag for conventional golf clubs.

Not only can the height of golf bag 1301 be significantly less than a conventional golf bag, but because the golf club heads according to embodiments can be stacked for more compact fit in golf bag 1301, the width and depth of golf bag 1301 are also considerably less than required for a conventional bag. This is a distinct advantage in travel since airlines charge significant fees for oversize bags, which all standard golf bags are.

FIG. 15 illustrates additional detail of loop sizing strap 1402 (also called a head strap pouch herein) and slash pocket 1422 inside course bag 1301 according to an embodiment of the present invention. In an embodiment, loop sizing strap 1402 comprises a Velcro loop portion 1502 and a Velcro hook portion 1504 bound to loop sizing strap 1402 using binding 1506. As shown FIG. 15 adjustable Velcro loop sizing strap 1402 and ring 1404 allow sizing a pocket in which to fit a detachable golf club head securely. In operation a golf club head is inserted into the pocket formed by golf club head strap 1402, which is then inserted through ring 1404, and the Velcro loop is cinched to secure the head by securing Velcro loop portion 1502 to Velcro hook portion 1504.

As shown in FIG. 15, course bag 1301 may also include a slash pocket 1422 and an additional slash pocket 1506 located on the outside of accessory pocket 1406.

FIG. 16 illustrates interior rigidity panels that can be used to add structure to course bag 1301 of FIGS. 13A-C according to an embodiment. As shown in FIG. 16, in a embodiment, golf bag 1301 is constructed using an inner stiff shell 1602. In an embodiment, the inner stiff shell 1602 comprises a back board 1604 and a vertical stiffening ring 1606. In an embodiment, back board 1604 is covered with cloth 1608, and vertical stiffening ring1606 is covered with cloth 1610. Inner stiff shell 1602 can be made from any suitable material including, for example, plastic, such as polyethylene, or any other suitable material, including, for example, aluminum, steel, titanium, graphite, and carbon fiber.

FIG. 17 illustrates details of a clip assembly 1700 to anchor clip 804 used to hold club shaft segments in place as described, for example, above with respect to FIG. 8. Backing panel 1604 is drilled where clip assembly 1700 is to be located. Rivets 1702 anchor clip base 1704 to backing panel 1604. Clip base 1704 contains a clocking dimple 1706 to coordinate proper placement and alignment of clip base 1704 on backing panel 1604. Clocking dimple 1706 fits within a hole or indentation 1712 appropriately located in backing panel 1604 to ensure proper location of clip base 1704. Clip base 1704 is covered by a material, such as cloth, 1710. A small slit in material 1710 allows a clip base post 1708 to be exposed. Base post 1708 includes holes 1714 for attaching clip 804. For example, in an embodiment, the top of the clip 804 is removable so that it can slide vertically along base post 1708 between an open position (center and top seating hole) and a closed position (center and bottom seating hole) using seating holes 1714.

FIGS. 17A-17F illustrate a clip assembly 1700 according to an embodiment of the present invention. As shown in FIGS. 17A-17F, a clip assembly 1700A includes a clip 804A, a clocking dimple 1706A, a clip base 1704A, a clip base post 1706A, and seating holes 1714A, each having a function similar to that described above for similarly named elements in FIG. 17 above. FIG. 17C illustrates clip 804 in a closed position. FIGS. 17A and 17D illustrate clip 804 in an open position.

As noted above, carry-on bags for air travel are limited to a maximum height of 22 inches. The foregoing golf set embodiments may not necessarily meet the carry on height requirement. To meet that requirement in an embodiment, a second coupler is incorporated into a golf club to further reduce the size of the bag and golf club set in unassembled form. The second coupler is located to allow golf club shaft portion 103 to be split into two portions. The portions do not have to be equal length. For example, in an embodiment, golf club shaft portion 103 is split just below grip 101. Exemplary applications for dual-coupler embodiments include air travel, travel to and from driving range or electronic range practice sites, and travel by motorcycle or scooter. In an embodiment, both portions are less than 22 inches in length.

In an embodiment, the second coupler is threaded. However, any coupling technique can be used. FIGS. 19A and 19B illustrate a coupler 1900 that allows golf club shaft portion 103 to be split into an upper shaft segment 1904 that includes the golf club grip and a lower shaft segment 1902. Referring to FIG. 19A, a threaded coupler shaft insert 1906 is inserted into lower shaft segment 1902. Threaded coupler shaft insert 1906 includes a threaded portion 1908 and a notch 1910. Threaded coupler shaft insert 1906 can be fixed to lower shaft segment 1902 by any appropriate technique including, for example, gluing. Threaded coupler shaft insert 1906 provides a receptacle 1912 for a coupler body 1914. In an embodiment, receptacle 1912 has a cavity that matches the shape of coupler body 1914. For example, in an embodiment, the cavity is such to allow insertion of a coupler body 1914 with a conical shape. In an embodiment, upper shaft segment 1904 and lower shaft segment 1902 are less than 22 inches in length.

Coupler body 1914 is affixed to upper shaft segment 805 by, for example, gluing. A threaded coupler ring 1980 is placed in position at the end of upper shaft segment 1904 opposite the grip. In operation threaded coupler ring 1980 threads into threaded coupler shaft insert 1906 to hold upper shaft segment 1904 and lower shaft segment 1902 tightly together.

An anti-rotation pin 1924 fits into notch 1910 through a hole 1925 to prevent upper shaft segment 1904 and lower shaft segment 1902 from rotating with respect to one another when a golf club according to an embodiment is used. Further anti-rotation can be achieved by using directional threading as described above. In particular, threading is preferably counterclockwise for right handed players and clockwise for left handed players. In use, this directional threading will tend to tighten the coupling between upper shaft segment 1904 and lower shaft segment 1902 when a player strikes a golf ball. FIG. 20 illustrates a cross section view of coupler 1900 with coupler body 1914 inserted into threaded coupler shaft insert 1906 to couple upper shaft segment 1904 with lower shaft segment 1902.

In an embodiment, upper shaft segment 1904 need be coupled with lower shaft segment 1902 only once prior to the start of play. That is, once coupled, there is no need to uncouple the shaft segments until the clubs are put away for transport. All that needs to be changed is the desired golf club head for a particular situation (e.g., golf lie).

FIG. 20A illustrates glue channels (or scoring) 1951 and 1950 in the interior of upper shaft segment 1904 according to an embodiment. Glue channels 1951 and 1950 are necessary for proper bonding of coupler and shaft. Golf club operation involves a variety of impulsive forces and stresses on parts. Glue channels 1950 and 1951 are in place to control rotational and axial forces from displacing component alignment. In one embodiment, glue channels 1950 and 1951 are cut into graphite shaft sections with high speed grinding bits: for example, circular channels (1951) and linear channels 1950. Channel depths may vary and are determined in part by engineering analysis and verified by field and automated testing. One embodiment uses depths of 0.010″. In another embodiment 0.008″ depth channels are cut using a left handed tap tool for threading. Threads provide both the axial and linear channels required for managing club forces. In another embodiment axial or threaded channels may be formed in graphite shafts as part of the manufacturing process by placing axial or threaded protruding features on the mandrel. FIG. 20B illustrate glue channels 1952 (circular) and 1953 (linear) in a coupler body 1914. Glue channels 1952 and 1953 serve a similar purpose as that described above for glue channels 1951 and 1950. In an embodiment, the scoring (glue channels) is on coupler body 1914. In another embodiment, the scoring is on fittings as described below. This scoring can be done to the components of coupler 200 to secure its housing to the golf club shaft and to secure the head shaft segment to the golf club head.

Graphite shafts are composed of layers of graphite fibers glued together on a mandrel. These fibers can separate at joints and must be held together by a hosel. FIG. 20C shows two hosels, a grip end hosel 1972 and a head end hosel 1970, that are designed for this purpose. In an embodiment grip end hosel 1972 and head end hosel 1970 are separate parts (e.g., rings). In an embodiment, grip end hosel 1972 is glued in place with the mating coupler body 1914. Head end hosel 1972 has both the advantage of preventing dissociation of the carbon fibers as well as preventing expansion of the shaft around the couplers glued region. This second advantage acts to lock the parts in place since the glue channels are now filled and expansion is impossible. A further advantage of the head hosel 1972 is alignment in assembly. The rings grip the shafts and help to align parts.

FIGS. 20C-20G, 20H1-20H9, 20I1-20I5, 20J1-20J3, 20K1-20K10, 20L1-20L5, 20M1-20M5, 20N1-20N5, and 20O1-20O3 illustrate a coupler 1900 according to an embodiment. FIG. 20C illustrates a coupler 1900 according to an embodiment with its primary component pieces separated to illustrate how they fit together. As shown in FIG. 20D, in an embodiment, coupler 1900 comprises a grip end fitting 1974, a coupler body 1914, an anti-rotation pin 1924, a head end fitting 1978, a collar 1980, a grip end hosel ring 1972, a head end hosel ring 1970, and a lock washer 1976. As illustrated in FIG. 20D, grip end fitting 1974 and head end fitting 1978 can have scoring as described above. This scoring can be on these parts rather than coupler body 1914. FIG. 20E illustrates coupler 1900 put together according to an embodiment. FIG. 20F is a cross section view of coupler 1900 taken through coupler 1900 at A-A′ as shown in FIG. 20E. FIG. 20G is a perspective view of coupler 1900 looking down through the grip end to the head end. FIG. 20H is a cross section view of coupler 1900 taken at BF-BF′ as shown in FIG. 20G.

FIGS. 20H1-20H9 illustrate a grip end fitting 1978 according to an embodiment. Grip end fitting 1978 is inserted in upper shaft segment 1904 and serves to attached coupler body 1914 to upper shaft segment 1904. As seen in FIGS. 20H1 and 20H2, in an embodiment, grip end fitting 1978 has scoring 1952 and 1953, as described above, which serves as glue channels to strengthen adhesion to a golf shaft. FIG. 20H4 is a cross section view of grip end fitting 1978 taken at BG-BG′ as shown in FIG. 20H3. FIG. 20H9 is a cross section view of grip end fitting 1978 taken at BH-BH′ as shown in FIG. 20H3. FIG. 20H6 is a perspective view showing detail CA as shown in FIG. 20H4. FIG. 20H5 is a perspective view showing detail CC as shown in FIG. 20H4. FIG. 20H7 is a perspective view of grip end fitting 1978 looking up from the bottom. FIG. 20H8 is a perspective view of grip end fitting 1978 looking down from the top.

FIGS. 20I1-20I5 illustrate a coupler body 1914 according to an embodiment. In an embodiment, coupler body 1914 includes a hole 1925 in which to insert an anti-rotation pin 1924. FIG. 2013 is a cross section of coupler body 1914 taken at E-E′ as shown in FIG. 2012. FIG. 2014 is a perspective view of coupler body 1914 looking up from the bottom. FIG. 2015 is a perspective view of coupler body 1914 looking down from the top.

In an embodiment, to aid in assembly, a portion of the exterior of coupler body 1914 is threaded. In addition, a portion of the interior of grip end fitting 1978 is threaded to match the threaded portion of coupler body 1914. In this way, coupler body 1914 can be screwed into grip end fitting 1978 for easier assembly. In an embodiment, coupler body 1914 and grip end fitting 1978 are manufactured as a single part.

FIGS. 20J1-20J3 illustrate an anti-rotation pin 1924 according to an embodiment. Anti-rotation pin 1924 helps to prevent rotation between upper shaft segment 1904 and lower shaft segment 1902 with respect to one another. FIG. 20J3 is a perspective view looking toward an end of anti-rotation pin 20J3 shown in FIG. 20J2.

FIGS. 20K1-20K10 illustrate a head end fitting 1906 according to an embodiment. As described above, head end fitting 1906 is inserted into lower shaft segment 1902 to receive coupler body 1914 to mate lower shaft segment 1902 with upper shaft segment 1904. As seen in FIGS. 20K1 and 20K3, in an embodiment, head end fitting 1906 has scoring 1952 and 1953, as described above, which serves as glue channels to strengthen adhesion to a golf shaft. FIG. 20K4 is a cross section view of head end fitting 1906 taken at C-C′ as shown in FIG. 20K2. FIG. 20K5 is a cross section view of head end fitting 1906 taken at D-D′ as shown in FIG. 20K2. FIG. 20K6 is a cross section view of head end fitting 1906 taken at CD-CD′ as shown in FIG. 20K3. FIG. 20K9 is a perspective view showing detail CG as shown in FIG. 20K4. FIG. 20K10 is a perspective view showing detail CE as shown in FIG. 20K4. FIG. 20K7 is a perspective view of head end fitting 1906 looking up from the bottom. FIG. 20K8 is a perspective view of head end fitting 1906 looking down from the top.

FIGS. 20L1-20L5 illustrate a collar 1980 according to an embodiment. In an embodiment, collar 1980 is used for decorative purposes, such as for placing a logo. FIG. 20L3 is a cross section of collar 1980 taken at CF-CF′ as shown in FIG. 20L2. FIG. 20L4 is a perspective view of collar 1980 looking up from the bottom. FIG. 20L5 is a perspective view of collar 1980 looking down from the top.

FIGS. 20M1-20M5 illustrate a head end hosel 1970 according to an embodiment. In an embodiment, head end hosel 1970 is used to prevent fiber separation in club shafts as described above. FIG. 20M3 is a cross section of head end hosel 1970 taken at DA-DA′ as shown in FIG. 20M2. FIG. 20M4 is a perspective view of head end hosel 1970 looking up from the bottom. FIG. 20M5 is a perspective view of head end hosel 1970 looking down from the top.

FIGS. 20N1-20N5 illustrate a grip end hosel 1972 according to an embodiment. In an embodiment, grip end hosel 1972 is used to prevent fiber separation in club shafts as described above. FIG. 20N3 is a cross section of grip end hosel 1972 taken at DB-DB′ as shown in FIG. 20N2. FIG. 20N4 is a perspective view of grip end hosel 1972 looking up from the bottom. FIG. 20N5 is a perspective view of grip end hosel 1972 looking down from the top.

FIGS. 20O1-20O3 illustrate a lock washer 1976 according to an embodiment. FIG. 20O3 is a perspective view looking toward a side of lock washer 1976 shown in FIG. 20O2.

FIG. 21 illustrates a fully assembled golf club using two couplers, coupler 1900 to couple an upper shaft segment to a lower shaft segment, and coupler 200 to couple a golf club head assembly to the lower shaft segment according to an embodiment. Using second coupler 1900, unassembled shaft segments can be reduced to less than 22″ overall length. This sizing allows for a golf club system according to an embodiment to fit in overhead storage for air travel, to fit in a car, and to fit in smaller storage areas, such as a backpack or panniers of a motorcycle.

Material selection for coupler components is critical to the proper function of the couplers. Both couplers experience significant stresses and forces in use. While these forces have an important impact on all component designs they are particularly important to areas where force is focused in a small area. Regions that touch ball bearings or anti-rotation pins must have significant hardness so that metal is not deformed under force. Through testing it was determined that Rockwell C54-C60 is an acceptable range for these areas of the couplers. Hardened areas can become brittle so hardening must be performed by inductive methods so that only key areas are sufficiently hard while other areas are left more malleable. For instance, the tip area of 1106 requires Rockwell C54-C60 while it is more important for the portion of 1106 outside that region to be more malleable. In one embodiment of the invention “Fatigue Proof” 1144 steel was used for all coupler components with selective inductive hardening as described. In another embodiment, 7068 aluminum was used for couplers designed for putter applications where stresses are minimal. Other materials may be used in other embodiments for coupler components.

Except for stainless steel, other steels rust in the natural environment. To combat this, coupler components in one embodiment are coated with Nickel, however, other coatings may be substituted by those skilled in the art.

In various places in the specification, threading of parts is discussed. In an embodiment, the threading uses the UNEF thread standard with a non-V-shaped base. This type of thread is able to withstand greater forces without shear.

In another embodiment, a golf bag is made to conform to the specifications of overhead travel in aircraft. FIG. 22 illustrates a front perspective view of an exemplary golf bag 2200 that is sized to fit within an overhead compartment of an airplane, also called a carry on bag. In an embodiment, golf bag 2200 uses a dual-coupler golf club system described above. As shown in FIG. 22, golf bag 2200 includes wheels 2202, a water pocket 2204, a zipper 2208, and an extendable handle 2206. FIG. 23 illustrates a side perspective view of golf bag 2200 with handle 2206 in an extended position.

FIGS. 24A and 24B illustrate internal detail of a three-fold panel structure or insert 2400. In an embodiment, three-fold panel structure 2400 that can be placed into carry-on bag 2200. FIG. 24A illustrates the three-fold panel structure folded and ready to be packed, for example, in bag 2200. FIG. 24B illustrates three-fold panel structure 2400 unfolded, as for example, to hang from a golf cart bag bar.

In an embodiment, for example, three-fold panel structure 2400 comprises one or more strap pouches 1402 and rings 1404 as described above with respect to FIG. 14 to store golf club heads. In addition to, or in lieu of, strap pouches 1402 and rings 1404, three-fold panel structure 2400 can include one or more clips 804 and loops 806 as described above with respect to FIG. 8 to store golf club heads.

Three-fold panel structure 2400 comprises a plurality of head strap pouches 1402 and clips 804 for holding a plurality of detachable golf club heads. FIGS. 25A and 25B illustrate sleeves and rods that provide a foldable stiff structure 2400 to golf bag 2200. As shown in FIGS. 25A and 25B, folded sections are stiffened and held in place by sleeves 2406 and rods 2408. In alternative embodiments, other methods may be utilized to facilitate the unfolding and need for rigidity during play. As shown in FIG. 25A, foldable stiff structure 2400 comprises straps 2410 on the back for encompassing and cinching foldable stiff structure 2400 to a golf cart. For example, in an embodiment, foldable stiff structure 2400 is cinched to the top bag bar of a golf cart using straps 2410. FIG. 26 illustrates a cross sectional view of a carry on golf bag 2200 with foldable stiff structure 2400 in folded position.

A single coupler embodiment may be used in a number of other supportive applications to the traditional golf set. For example, in an embodiment, a coupler housing is placed in a shaft or a putter, and a coupling pin is inserted into short shaft segments of putters. This allows players to select putter heads as desired in the course of play and may be an addition to a standard set of clubs. For example, FIG. 27 illustrates a standard golf bag 2700 configured with a sleeve support 2701 for a putter shaft or golf club shaft. In an embodiment, sleeve support 2801 comprises or is a tube, such as for example, a plastic tube. A golf club shaft portion 2703, such as golf club shaft portion 103, can be placed in sleeve support 2701. The length (height) of sleeve support 2701 is such that a grip 2702 of golf club shaft portion 2703 is accessible from the top of bag 2700. In an embodiment, sleeve support 2701 is attached to golf bag 2700 using an over grip 2704. In an embodiment, over grip 2704 fits over a lip at the top of golf bag 2700. In an embodiment, over grip 2704 is secured to bag 2700, for example, by using Velcro.

In another embodiment, a coupler housing is placed in the shaft of a long putter to facilitate the quick breakdown and reassembly of the long putter for travel. For example, FIG. 28 illustrates a standard golf bag 2800 configured with a dual-sleeve 2804 design that supports a long-shafted putter. The putter is stored in separate sleeves as its component golf club shaft portion 2806 and golf club head portion 2808. In this exemplary case, golf club head portion 2808 includes a putter head 2802. Golf club shaft portion 2806 includes a grip 2801. In an embodiment, each sleeve comprises or is a tube, such as a plastic tube. In an embodiment, dual sleeve 2804 is attached to golf bag 2800 using an over grip 2803. In an embodiment, over grip 2803 fits over a lip at the top of golf bag 2800. In an embodiment, over grip 2803 is secured to golf bag 2800 using Velcro. Both golf club shaft portion 2806 and golf club head portion 2808 are stored for easy travel in dual sleeve 2804. Any desired club can be stored in sleeve 2804.

An alternative method for modification of long-shafted putters is to insert coupler 200 into the shaft 2801 such that the length of the shaft is somewhat less than 45″ (the length of a driver). Golf club head portion 2808 can then be put in a golf bag pocket, as described above, and shaft 2801 placed directly in the bag.

In another exemplary aspect, the coupler housing is placed in a shaft and coupling pins are inserted into the short shaft segments of wedges and putter heads. This facilitates the creation of travel extension sets that augment rented clubs and typically have poor short game clubs.

Putter fitting is another exemplary application of embodiments of the present invention. In golf, putters present the greatest choice of designs in terms of head styles and shaft lengths. As a result, golf retail stores typically have dozens of putters on their floor for trial by customers. Each putter style comes in a variety of shaft lengths to accommodate players of differing height. The matrix of permutations of combinations of putter head styles and shaft lengths is very large, and would require a store to carry hundreds of putters to provide a complete array of options for testing by customers. Use of coupler housing 200 and head coupler pin 106 in putter fitting applications can reduce significantly the number of required floor sample putters because a small number of shafts can be shared across the various putter head styles. The quick disconnect and reconnect features of coupler housing 200, and head coupler pin 106 into a fitting system have distinct business advantages. For example, being able to snap in any head to any shaft handle combination allows significant reduction in the number of clubs required in a fitting kit.

In some cases, it is desirable to carry additional heads, for example, to enhance a set of rented clubs or to have additional golf club options available for a particular situation. As such, traveling with a few heads in a small bag that can be attached to a golf bag is desirable. These additional golf club heads might be a putter head or short game wedge heads, or any other desired golf club head. In an embodiment, side or travel bag attachments are described that provide additional golf club sets through additional interchangeable golf club heads.

FIG. 29 illustrates a side or travel bag 2900 for carrying additional golf club heads. Travel bag 2900 attaches to a golf bag 2909 using an over grip 2906. In an embodiment, over grip 2906 includes a Velcro lining 2910 to more securely attach small travel bag 2900 to golf bag 2909. Alternatively, or in addition to over grip 2906, golf bag 2909 includes a tie 2902 and/or a Velcro patch 2911 on golf bag 2909. Golf club heads are stored as described above with respect to other golf bag embodiments. For example, as shown in FIG. 29, club heads are stored using club strap pouches 2904 and 2905, and clips 2903. Some putter designs may favor pouches opening via Velcro 2908 or with their short shaft segments and pins placed through slots, such as slot 2912, in club strap pouch 2914. FIG. 29 illustrates an exemplary travel bag 2900 open with only one side of the bag secured to golf bag 2909 using both Velcro patch 2911 and tie 2902. As shown in FIG. 29 a putter head 2907 is stored in a strap that has a Velcro opening through which the golf head shaft segment of putter head 2907 coupler pin of putter head 2907 fit when stored.

In another embodiment, a back pack style golf bag 3000 is created for travel. FIG. 30 shows a side perspective view and a back perspective view of golf bag 3000. In an embodiment, golf bag 3000 comprises shoulder straps 3003 with adjustments 3004, and a zipper 3002.

FIG. 31 illustrates the inside of golf bag 3000 according to an embodiment. As shown in FIG. 31, in an embodiment, golf bag 3000 comprises a plurality of club strap pouches 3109 and clips 3108, shaft securing sleeves 3115 and 3118, and shaft securing elastic straps 3116 and 3117 to secure golf club shaft portions 3104 and 3105. Sewn pouches and/or clips 3108 as described above with respect to FIGS. 8 and 14 hold golf club heads such as golf club head 3120. In an embodiment, only clips 3108 are used to hold golf club heads. In an embodiment, as described above, foam cutouts may be used in place of the sewn pouches and clips.

In an embodiment, the back 3110 of the golf bag 3000 rotates down (as shown) when unzipped using zipper 3111 to display a computer tablet pouch 3103. In an embodiment, a computer tablet can be inserted into computer tablet pouch 3103 via a slot 3102 and is held in position by a material 3119. Three legs 3101 are extended from the bottom of the bag and secured into their operational position as shown. In an embodiment, legs 3101 are telescoping and comprise sections 3113 and 3114. In an embodiment, protective feet 3112 are included at the ends of legs 3101, which provide additional stability to golf bag 3000 when it is in an standing configuration as well as protection to underlying surfaces. Exemplary designs for legs 3101 are available in the public domain and would be known to those skilled in the art.

Embodiments allow interworking with swing sensing performance monitors, club sensing for tracking, and training and video interactivity as well as gamification (for example, data collection for use in gaming or instruction) of all aspects of practice and play. FIG. 32 illustrates a system 3200 for collecting data related to using a golf club according to an embodiment. As shown in FIG. 32, the invention a set is configured with a swing motion sensing device 3201 placed on a golf club shaft 3206. Swing motion sensing device 3201 collects swing motion information (for example, swing parameters) for presentation to either a belt computing device (or other computing device such as a smart phone) 3204, or a tablet computer 3205 in tablet computer pouch 3103 of a golf bag 3000 (or other golf bag embodiment with a computer tablet pouch). If desired, club identification information (such as identification of club head 3207) is sent by RFID tag 3203 to any or all of these devices. In an embodiment, golf club head 3207 is a detachable golf club head and RFID tag 3203 is affixed to the head shaft segment of golf club head 3207, and configured particularly for the type of detachable golf club head 3207 (driver, 3-wood, 7-iron, putter, etc.).

In an embodiment, any number of these components can be combined to allow for interactive software applications to be created for use in play, practice, and or gamification. FIG. 33 is a schematic diagram of an exemplary system 3300 for collecting golf-related data for use in play, practice, and/or gamification. As shown in FIG. 33, a golfer 3301 uses a golf club 3303. Golf club 3303 is configured with an RFID tag 3306 and a swing motion sensing device 3308. RFID tag 3306 contains information concerning a club head 3307 of golf club 3303. Swing motion sensing device 3308 collects swing motion data, such as swing parameters. Golfer 3301 has a belt computing device (or other computing device such as a smart phone) 3302. In an embodiment, computing device 3042 is configured to collect data from RFID tag 3306 and/or swing motion sensing device 3308.

Data from RFID tag 3306 and/or swing motion sensing device 3308 is collected by a data collection device 3310. Data collection device 3310 can be computing device 3302. In an alternative embodiment, data collection device 3310 is a computer tablet, such as computer tablet 3305 shown in FIG. 33. Data collection device can also collect video that may have been captured related to golfer 3301's golf swing.

Data collection device forwards collected data to a local application process 3312. Local application process 3312 can be executing on computing device 3312 or a computer tablet such as computer tablet 3305 shown in FIG. 33. Local application process provides a user interface 3314 to golfer 3301. In a practice scenario, user interface 3312 may provide information to golfer 3301 as to various parameters concerning his or her golf swing that golfer 3301 uses to improve his or her golf swing. In a gamification scenario, user interface 3312 may provide views of a simulated golf course upon which a ball is shown whose location is dependent upon the data collected pertaining to golfer 3301's golf swing and the type of club head indicated by RFID 3306 data.

Collected data can be sent to a central location for storage. For example, in an embodiment, local application process 3312 communicates with a cloud network 3316. Cloud network 3316 can be any combination of gateways, routers, servers, or other devices that provide communication from one node to another in a network. Cloud network 3316 can be any network architecture including a local area network (LAN), a wide area network, (WAN), can be any combination of a public and/or private network, and can include any number of devices. An exemplary cloud network is the Internet. Ultimately, an application server process 3312 executing on a server in cloud network 3316 accepts the data transmitted by local application process 3312 through cloud network 3316. Application server process 3318 can store the data in a user data base 330. Additional data may be stored along with identification information for golfer 3301, such as name, account number, and/or other identifying information so golfer-specific data can be retrieved. Other information, such as date, time, location, hole number, or other information also can be stored. Application server process 3318 can also store video data that may have been collected by data collection device 3310 in a video store 3322.

Application server process 3318 can also provide information to local application process 3312 to be used in processing data received from data collection device 3310 and/or provided to golfer 3301. In an embodiment for practice, for example, application server process 3318 can obtain instructional video from video store 3322 to send to local application process 3312 to put on user interface 3314. Local application process 3312 can analyze data received from data collection device 3310 and make recommendations to golfer 3301 to correct his or her swing on user interface 3314. In an embodiment for gamification, application server process may access library 3324 to obtain course map information pertaining to a golf course selected by golfer 3301 to play a simulated round on. That course map data (either a whole course or a portion thereof, for example, one hole on the course) may be downloaded to local application process 3312 through cloud network 3316. Local application process 3312 can use this information along with data collected from data collection device 3310 to simulate a golf shot on the chosen golf course, which is displayed on user interface 3314.

FIGS. 34A-34F illustrate an embodiment of a golf bag 3400 for storing and transporting a golf club set according to another embodiment. As shown in FIG. 34A, golf bag 3400 includes a foam insert 3402 in which are stored golf club heads 3404 a, 3404 b, 3404 c, 3404 d, and 3404 e. In addition, lower shaft segment 1902 and upper shaft segment 1904 are stored in foam insert. In addition, a lap belt 3403 is provided to facilitate carrying golf bag 3400 on one's back. FIG. 34B is a side perspective view of golf bag 3400 showing straps 3414 for use when carrying golf bag 3400 on one's back. FIG. 34C is a top perspective view of golf bag 3400. FIGS. 34D and 34F illustrate a top panel 3412 that can be opened and/or removed to provide access to club heads 3404 a, 3404 b, and 3404 c as well as lower shaft segment 1902 and upper shaft segment 1904. In an embodiment, golf bag 3400 also includes a removable computer tablet pouch 3414. FIG. 34E illustrates an extendable leg 3502 option that provides support for golf bag 3400 when in use, for example, while playing a round of golf. FIGS. 34G-34J provide additional views of foam insert 3402. FIG. 34G illustrates slots, such as slot 3408, in foam insert 3402 into which club heads are inserted for storage. In an embodiment the slots are labeled according to the club head stored in the slot. FIG. 341 shows how the different length head shaft segments fit.

FIGS. 35A-35C illustrates a telescoping leg option that provides a support stand for bag 3400 in use. As shown in FIG. 35A, extendible leg 3502 is attached to a backing support 3504 by brackets 3510 a and 3510 b. Backer support 3504 provides structure to the back and bottom of golf bag 3400. As shown in FIG. 35B extendible leg 3502 is extended by opening a press clamp 3506. A screw 3512 can be used to tighten press clamp 3506 as required. FIG. 35C illustrates a foot support 3508 that provides support for the golf bag assembly to prevent movement in a golf cart.

FIG. 36 illustrates a removable computer tablet pouch panel 3602 according to an embodiment. As shown, removable computer tablet pouch panel 3602 can be removed entirely or just opened using a zipper 3606. Removable computer tablet pouch panel 3602 provides a convenient carrying tool for a computer tablet device.

FIG. 37 illustrates a removable computer tablet pouch panel 3702 according to an embodiment. As shown, removable computer tablet pouch panel 3702 can be removed entirely or just opened using a zipper 3706. Unlike removable computer tablet pouch panel 3602, removal of removable computer tablet pouch panel 3702 does not provide access to the interior of golf bag 3400. A second panel 3704 must be opened. Removable computer tablet pouch panel 3702 provides a convenient carrying tool for a computer tablet device.

FIG. 38A illustrates expandable side panels 3802 in golf bag 3400 according to an embodiment. Expandable side panels 3802 can be used for additional carrying capacity, and collapsed when not in use. In an embodiment, expandable side panels 3802 include pockets 3804. Pockets 3804 can be used for any purposes, such as for carrying bottles for water, soda, etc. FIG. 38B illustrates golf bag 3400 and expandable side panels 3802 in their collapsed position, and an internal pocket 3806 closed. FIG. 38B illustrates golf bag 3400 with expandable side panel 3802 in an expanded position, and internal pocket 3806 open. FIG. 38D illustrates that in an embodiment expandable side panel 3802 is removable from the main body of golf bag 3400 using a internal zipper 3808.

FIG. 39 illustrates a handle 3902 that, in an embodiment, is sewn into a top portion 3904 of golf bag 3400. When not in use, in an embodiment, handle 3902 can be tucked away in a slash pocket 3906.

FIG. 40 illustrates straps 3418 in an embodiment used to store one or more golf tees 3420.

The foregoing disclosure of the preferred embodiments of the present invention has been presented for purposes of illustration and description. It is not intended to be exhaustive or to limit the invention to the precise forms disclosed. Many variations and modifications of the embodiments described herein will be apparent to one of ordinary skill in the art in light of the above disclosure. The scope of the invention is to be defined only by the claims appended hereto. and by their equivalents.

Further, in describing representative embodiments of the present invention, the specification may have presented the method and/or process of the present invention as a particular sequence of steps. However, to the extent that the method or process does not rely on the particular order of steps set forth herein, the method or process should not be limited to the particular sequence of steps described. As one of ordinary skill in the art would appreciate, other sequences. of steps may be possible. Therefore. the particular order of the steps set forth in the specification should not be construed as limitations on the claims. In addition, the claims directed to the method and/or process of the present invention should not be limited to the performance of their steps in the order written. and one skilled in the art can readily appreciate that the sequences may be varied and still remain within the spirit and scope of the present invention. 

What is claimed is:
 1. A golf club system, comprising: a shaft with a grip and a coupler, the coupler having a coupler housing that has a housing attachment pin that is attached to the shaft to attach the coupler, the shaft having an interior surface that is scored to accept glue to firmly attach the housing attachment pin; a plurality of golf club head assemblies, each golf club assembly having a golf club head attached to a second shaft, each second shaft having a second shaft length that is shorter than the shaft length of the first shaft, and a head coupler pin attached to each second shaft; wherein the coupler is configured to accept each head coupler pin of each golf club assembly to tightly couple the first shaft to the second shaft.
 2. The golf club system of claim 1, further comprising a hosel.
 3. The golf club system of claim 1, wherein the coupler housing comprises an interior surface and a plurality of ball bearings that contact the interior surface of the coupler housing and wherein the coupler head pin comprises an exterior surface that contacts the plurality of ball bearings, and wherein the portion of the coupler housing interior surface that contacts a ball bearing and the portion of the exterior portion of the head coupler pin that contacts a ball bearing are hardened, and the remaining portions of the coupler housing and the head coupler pin are not hardened.
 4. The golf club system of claim 1, wherein the coupler head pin has a conical shape.
 5. The golf club system of claim 1, wherein the shaft assembly comprises a second coupler.
 6. The golf club system of claim 5, wherein the second coupler is threaded.
 7. The golf club system of claim 6, wherein the threading is directional.
 8. The golf club system of claim 7, wherein the second coupler includes a receptacle that can receive a second coupler pin.
 9. The golf club system of claim 8, wherein the second coupler pin has a conical shape.
 10. The golf club system of claim 1, further comprising a golf club bag to store the plurality of golf club head assemblies and the shaft assembly.
 11. The golf club system of claim 10, wherein the golf bag is a backpack.
 12. The golf club system of claim 10, wherein the golf bag includes a computer tablet.
 13. The golf club system of claim 1, wherein the coupler includes a pin to prevent rotation of the golf club head assembly with respect to the golf club shaft assembly.
 14. The golf club system of claim 5, wherein the wherein the second coupler includes a pin to prevent rotation of the golf club head assembly with respect to the golf club shaft assembly.
 15. The golf club system of claim 1, wherein each second shaft has a length that depends upon the golf club head to which it is attached.
 16. A golf club system comprising: a golf club shaft assembly comprising an upper shaft segment having a grip, a coupler body attached to the shaft and a threaded collar, and a lower shaft segment having a receptacle for receiving the coupler body, and a threaded portion to receive the threaded collar to forcibly mate the lower shaft segment to the upper shaft segment, the lower shaft segment also comprising a second coupler; and a plurality of golf club head assemblies, each golf club head assembly comprising a golf club head attached to a head shaft segment, and a head coupler pin attached to the head shaft segment that fits into the second coupler to forcibly mate the golf club head assembly with the lower shaft segment.
 17. The golf club system of claim 16, wherein the first coupler includes an anti-rotation pin to prevent rotation of the golf club head assembly with respect to the golf club shaft assembly.
 18. The golf club system of claim 16, wherein the second coupler includes an anti-rotation pin to prevent rotation of the golf club head assembly with respect to the golf club shaft assembly.
 19. The golf club system of claim 16, wherein the coupler body is conical in shape.
 20. The golf club system of claim 16, wherein the head coupler pin is conical in shape.
 21. The golf club system of claim 16, wherein both the first and second couplers have portions that are hardened and portions that are not hardened.
 22. The golf club system of claim 16, wherein the head shaft segment has an interior that has a scoring to accept glue for firmly attaching the head coupler pin to the head shaft segment.
 23. The golf club system of claim 16, wherein the second coupler has a coupler attachment pin, and the lower shaft segment has an interior that has a scoring to accept glue for firmly attaching the second coupler to the lower shaft segment.
 24. The golf club system of claim 16, wherein each head shaft segment has a length dependent on the golf club head to which it is attached. 